64 pieces
Explanation:
Here, we have 64 smaller pieces,
∴ Minimum cuts would be obtained when we have equal number of pieces along all 3 axes.
∴ 64 = 4 × 4 × 4
⇒ 4 pieces along each axis.
⇒ 3 cuts along each axis
∴ 9 cuts total.
Hence, 9.
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